Process for monitoring operation of an exhaust gas treatment system

US6367320B1 · kind B1 · utility

Assignees

• Dr. Ing. h.c. F. Porsche AG · DE
• AUDI AG · DE
• Bayerische Motoren Werke Aktiengesellschaft · DE
• Daimlerchrysler AG · US
• VOLKSWAGEN AKTIENGESELLSCHAFT · DE

Inventors

• Paul Kueper · Wiernsheim, DE
• Stefan Peter · Groß-Umstadt, DE
• Michael Illek · Stuttgart, DE
• Jens Mueller · Löhne, DE
• Christian Goerigk · Hemmingen, DE
• Stefan Wessels · Diez, DE

Key dates

• Filing date: May 26, 2000
• Grant date: Apr 9, 2002
• Expiry date: May 26, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for monitoring the operation of a system for the aftertreatment of exhaust gas utilizes respective temperature sensors assigned to catalysts in the exhaust gas system. In addition, a sensor for detecting the NOx content in the exhaust gas is assigned to a reduction catalyst. The detected values, or functions thereof, are in each case compared with the definable reference values and when these definable limit values are exceeded, a corresponding defect information is triggered.